I'm not trying to argue. I consider you something of a friend and I see that you're having a really rough time right now. It's not just this thread. I do understand where you're coming from here, because it really is frustrating to only be given the same advice over and over, especially on top of your daily life. I respect you as an artist and a person, but right now, I think it might be a good idea to take a little break.
The only advice and suggestion I'm going to give here, and this isn't just an art thing, it's a life thing, is this:
"To tell yourself that you can't do something is to bar yourself from achieving success."
And remember, there's nothing wrong with getting frustrated with yourself. All artists get that way, especially when we can't figure something out.
I sincerely hope that you feel better soon. Take care of yourself.